You have an old-style reel lawn mower at home. No engine! You need to cut the grass but also finish in time to watch your favorite TV show. How would you apply Newton’s second law of motion here?

A manually-operated lawn mower needs a lot of force to move. The mower mechanism and the energy needed to cut through the grass causes a lot of friction. In order to cut the grass faster, you need to overcome all that friction and get a net positive force on the lawn mower. Thus, you need to apply more force to it. It also helps a lot to reduce friction, so oil the mower and keep the blades sharp.

Explanation:

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